@prdmb1957 posted:
The motor in your photo is what Greenberg classifies as a Type 4, made between 1919 and 1924. They were used in the 150 series locomotives, of which there is still a pretty large supply.
I could take the brushplate off of one of my surplus motors that I'm not likely to use in a loco restoration. Sometimes I strip them and sell for parts.
I'll take this opportunity to note that I'm always looking for junk condition 150 and 250 series engines. If you have any messed up such engine that you don't know what to do with, I'm a buyer if it's cheap enough.